Nonlinear dynamical parameter identification method of vibration type energy collector

The invention relates to a nonlinear dynamical parameter identification method of a vibration type energy harvester, and belongs to the field of energy harvesting. According to the method, the problem that the parameters of the harvester cannot be accurately evaluated when the harvester contains unknown linear restoring force is solved. On the basis of a harvester restoring force equation, a restoring force three-dimensional data set is established by use of experimental data; the cross section of a restoring force curved surface is established through an interpolation method; a rigidity curve and a damping curve are identified through rearranging data in ascending sequence; through adoption of a least square method, and rigidity or damping data points are fitted by use of a polynomial equation. According to the method, a harvester restoring force model is unnecessarily pre-judged, and therefore, the method is suitable for dynamical parameter identification of various complex nonlinear harvesters. Compared with the prior art, the method has the advantages that the dynamical model identification and parameter identification problems of the vibration type energy harvester are solved under the condition that the restoring force model is unknown, and the theoretical basis is established for design and optimization of the vibration type energy harvester.